An inhibitor of the Ca2+-ATPases in the sarcoplasmic and endoplasmic reticula inhibits transduction of the gravity stimulus in cress roots
1992
Sievers, A. | Busch, M.B.
Cress (Lepidium sativum L.) roots were treated with 20 micromolar cyclopiazonic acid (CPA), an inhibitor of the Ca2+-transporting ATPases present in the sarcoplasmic/endoplasmic reticulum of animals and the endoplasmic reticulum of plants, in order to investigate its effect on the gravitropic response. Root growth was not significantly reduced by the applied dose of CPA, but the gravitropic response (curvature) was drastically inhibited. We hypothesize that the ER Ca2+-ATPase of statocytes is involved in transduction of the gravity stimulus and that CPA disturbs a cytosolic Ca2+ signal necessary for graviperception.
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